21122260 has 12 divisors (see below), whose sum is σ = 44356788. Its totient is φ = 8448896.

The previous prime is 21122251. The next prime is 21122267. The reversal of 21122260 is 6222112.

It can be written as a sum of positive squares in 2 ways, for example, as 8191044 + 12931216 = 2862^2 + 3596^2 .

It is a super-2 number, since 2×21122260² = 892299735015200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528037 + ... + 528076.

It is an arithmetic number, because the mean of its divisors is an integer number (3696399).

Almost surely, 2^21122260 is an apocalyptic number.

21122260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122260 is an abundant number, since it is smaller than the sum of its proper divisors (23234528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122260 is a wasteful number, since it uses less digits than its factorization.

21122260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056122 (or 1056120 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21122260 is about 4595.8959953419. The cubic root of 21122260 is about 276.4267884173.

Adding to 21122260 its reverse (6222112), we get a palindrome (27344372).

The spelling of 21122260 in words is "twenty-one million, one hundred twenty-two thousand, two hundred sixty".